brain-hackers_pepepper-mirror
/
linux-brain
mirror of https://github.com/brain-hackers/linux-brain.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

HID: i2c-hid: Ignore input report if there's no data present on Elan touchpanels 

While using Elan touchpads, the message floods:
[  136.138487] i2c_hid i2c-DELL08D6:00: i2c_hid_get_input: incomplete report (14/65535)

Though the message flood is annoying, the device it self works without
any issue. I suspect that the device in question takes too much time to
pull the IRQ back to high after I2C host has done reading its data.

Since the host receives all useful data, let's ignore the input report
when there's no data.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
This commit is contained in:
Kai-Heng Feng 2019-01-07 15:24:29 +08:00 committed by Benjamin Tissoires
parent cf26057a94
commit 1475af255e
1 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/hid/i2c-hid/i2c-hid-core.c
View File

@ -50,6 +50,7 @@
#define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET BIT(1)
#define I2C_HID_QUIRK_NO_RUNTIME_PM BIT(2)
#define I2C_HID_QUIRK_DELAY_AFTER_SLEEP BIT(3)
#define I2C_HID_QUIRK_BOGUS_IRQ BIT(4)
/* flags */
#define I2C_HID_STARTED 0
@ -179,6 +180,8 @@ static const struct i2c_hid_quirks {
I2C_HID_QUIRK_DELAY_AFTER_SLEEP },
{ USB_VENDOR_ID_LG, I2C_DEVICE_ID_LG_8001,
I2C_HID_QUIRK_NO_RUNTIME_PM },
{ USB_VENDOR_ID_ELAN, HID_ANY_ID,
I2C_HID_QUIRK_BOGUS_IRQ },
{ 0, 0 }
};
@ -503,6 +506,12 @@ static void i2c_hid_get_input(struct i2c_hid *ihid)
return;
}
if (ihid->quirks & I2C_HID_QUIRK_BOGUS_IRQ && ret_size == 0xffff) {
dev_warn_once(&ihid->client->dev, "%s: IRQ triggered but "
"there's no data\n", __func__);
return;
}
if ((ret_size > size) || (ret_size < 2)) {
dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
__func__, size, ret_size);